Cold Rolled DIN 1.4438 Stainless Steel Pipe
1.4438 steel pipe is a molybdenum-containing stainless steel with excellent corrosion resistance and strength. It is widely used in highly corrosive environments in chemical industry, food processing and other fields. 1.4438 stainless steel pipe has high resistance to stress corrosion, giving it superior durability in corrosive environments such as chemicals and pharmaceuticals.
1.4438 acid-resistant steel pipe has good resistance to pitting corrosion and intergranular corrosion in high-salt environments such as seawater desalination and salt chemical industry.
The corresponding domestic and foreign brands of 1.4438 are: X2CrNiMo18-15-4, 317L and SUS317L. 1.4438 has good thermal and cold fatigue resistance in cooling towers, heat exchangers and other equipment, extending the service life.
1.4438 seamless stainless steel pipe plays an important role in the field of environmental protection because its corrosion resistance helps reduce environmental pollution from waste. The chemical composition of 1.4438 stainless steel composite pipe is: Cr 17-19%, Ni 13-16%, Mo 2.5-3.0%, C ≤0.03%. 1.4438 can improve its corrosion resistance by adding alloy elements such as molybdenum and tungsten to adapt to more severe application environments.
SS DIN 1.4438 Tubes Physical Properties
| Grade | DIN 1.4438 | |
|---|---|---|
| Density (kg/m3) | 8000 | |
| Elastic Modulus (GPa) | 193 | |
| Mean Coefficient of Thermal Expansion (m/m/0C) | 0-1000C | 15.9 |
| 0-3150C | 16.2 | |
| 0-5380C | 17.0 | |
| Thermal Conductivity (W/m.K) | at 1000C | 14.2 |
| at 5000C | 18.7 | |
| Specific Heat 0-1000C (J/kg.K) | 500 | |
| Electrical Resistivity (n.m) | 740 | |
Stainless Steel DIN 1.4438 Tubes Equivalent Grades
| Grade | 317L | |
| UNS No | S31703 | |
| Old British | BS | – |
| En | X2CrNiMo18-15-4 | |
| Euronorm | No | 1.4438 |
| Name | – | |
| Swedish SS | – | |
| Japanese JIS | SUS 317L | |
DIN 1.4438 SS Seamless Tubes
(1.4438)Mechanical properties
Rm - Tensile strength (MPa) (+A) 500-720
Rm - Tensile strength (MPa) (+AT) 490-690
[R P0.2 0.2% Yield Strength (MPa) (+A) 200-240
[R P0.2 0.2% Yield Strength (MPa) (+AT) 220
KV - Lateral impact energy (J), (+A) +20°
KV - Impact Energy (J) Longitudinal, (+A) +20°
A - Minimum. Elongation at break (%) (+A) 35-40
Brinell hardness (HB): (+A) 215
Brinell hardness (HB): (+AT) 200
This type of steel is often widely used in some special fields, such as petrochemical industry, marine engineering, pharmaceutical manufacturing, etc. In the petrochemical industry, it can be used to manufacture containers, pipelines and equipment, and can effectively resist corrosion, high temperature and other harsh environments.
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